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3*x+(4/3)*y = 9 // - 9
3*x+(4/3)*y-9 = 0
3*x+4/3*y-9 = 0 // - 4/3*y-9
3*x = -(4/3*y-9) // : 3
x = (-(4/3*y-9))/3
x = (9-(4/3*y))/3
x = (9-(4/3*y))/3
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